<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>盒子练习</title>
    <style>
        #d1{
            width:100px;
            height:100px;
            background-color: red;
            margin: 25px 0 0 25px;
            overflow: hidden;
        }
        div>div{
            width: 50px;
            height: 50px;
            background-color:blue;
            margin: 25px 0 0 25px;


        }
        #d2{
            width: 50px;
            height: 50px;
            border: 4px solid green;
            border-radius: 4px;
            margin-left: 125px;
            padding:50px 0 0 50px;


        }




    </style>


</head>
<body>
<div id="d1">
    <div></div>
</div>
<div id="d2">哈喽</div>


</body>
</html>